Comparing MSR D4K and Firefly PL09 Flashlights

Aug 23, 2024

Comparison and Review of MSR D4K and Firefly PL09 Flashlights

Introduction

  • Focus on two flashlights: MSR D4K and Firefly PL09.
  • Comparison and review format.
  • Highlight beam shots and specs.

Beam Shots

  • Indoor Shots:

    • White ceiling, 3-4 feet away.
    • Lowest setting (Moonlight setting).
  • Outdoor Shots:

    • 75 yards away, highest setting (turbo).
    • Comparison with MSR D1 V2 (SFT 40).

Specifications

  • Both lights use 21700 batteries.
  • Equipped with 519A emitters (recommendation from flashlight community).
  • Emitter Comparison:
    • Previously recommended: 18650 batteries and 219B emitters.
    • Current preference: 21700 batteries and 519A emitters.
    • Emitters: Nichia 519A has better efficiency and color rendering compared to 219B.

Design and Size

  • Size Comparisons:
    • D4K is slightly larger than D4 V2.
    • MSR D1 V2 has a wider head than both lights.
  • Carryability:
    • D4K and Firefly PL09 are considered pocket-carriable.
    • Comparison with larger DM11 flashlight.

Beam Performance

  • Optics:
    • Quad emitter TIR lenses, better light direction than reflectors.
    • Firefly PL09 delivers slightly better throw.
    • D4K has D-domed 519A for improved beam quality.

Heat Performance

  • Both lights get very hot on turbo setting.
  • Quad emitters produce more heat (4 times more than single emitter).
  • User Experience:
    • Temperatures become uncomfortable within 30 seconds of maximum brightness.
    • Preference for single emitter lights due to heat production.

Additional Features

  • Auxiliary Lights:
    • D4K has RGB capabilities for auxiliary lights.
    • Firefly PL09 has purple front-facing auxiliary lights.
  • Button Light Functionality:
    • D4K’s button prongs found uncomfortable during pocket carry.
    • Firefly PL09 has a button light that cannot be turned off.

Pricing

  • D4K priced around $60-$70.
  • Firefly PL09 priced around $50-$60.

Conclusion

  • Consider personal preferences regarding heat, button light, and design.
  • Both flashlights offer good performance but have specific issues.
  • Recommendations based on user comfort and practicality in daily use.

Final Thoughts

  • Engage with the community for further discussions.
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